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Fair Value Measurements - Carrying Value and Estimated Fair Value of Financial Instruments (Detail) - USD ($)
$ in Millions
Jun. 30, 2015
Dec. 31, 2014
Fair Value Of Other Financial Instrument [Line Items]    
Derivatives $ 5,480 $ 7,258
Derivatives 6,691 8,413
Level 1 [Member]    
Fair Value Of Other Financial Instrument [Line Items]    
Short-term financial assets 1,077 891
Federal funds sold and securities purchased under resale agreements 0 0
Non-derivative trading assets 2,988 2,675
Derivatives 8 10
Securities 19,565 22,048
Commercial loans, net of allowance for credit losses 0 0
Short-term financial liabilities 0 0
Consumer loans, net of allowance for credit losses 0 0
Short-term borrowings designated under fair value option 0  
Deposits designated under fair value option 0 0
Non-derivative trading liabilities 500 653
Derivatives 7 8
Long-term debt 0 0
Long-term debt designated under fair value option 0 0
Level 1 [Member] | Commercial Loans [Member]    
Fair Value Of Other Financial Instrument [Line Items]    
Commercial loans designated under fair value option and held for sale 0 0
Loans held for sale 0 0
Level 1 [Member] | Consumer Loans [Member] | Residential Mortgage [Member]    
Fair Value Of Other Financial Instrument [Line Items]    
Loans held for sale 0 0
Level 1 [Member] | Consumer Loans [Member] | Other consumer [Member]    
Fair Value Of Other Financial Instrument [Line Items]    
Loans held for sale 0 0
Level 1 [Member] | Deposits Without Fixed Maturities [Member]    
Fair Value Of Other Financial Instrument [Line Items]    
Deposits 0 0
Level 1 [Member] | Deposits With Fixed Maturities [Member]    
Fair Value Of Other Financial Instrument [Line Items]    
Deposits 0 0
Level 2 [Member]    
Fair Value Of Other Financial Instrument [Line Items]    
Short-term financial assets 20,059 30,807
Federal funds sold and securities purchased under resale agreements 16,112 1,413
Non-derivative trading assets 7,757 9,722
Derivatives 5,440 7,200
Securities 27,847 21,787
Commercial loans, net of allowance for credit losses 0 0
Short-term financial liabilities 10,672 12,813
Consumer loans, net of allowance for credit losses 0 0
Short-term borrowings designated under fair value option 2,070  
Deposits designated under fair value option 4,815 5,378
Non-derivative trading liabilities 169 52
Derivatives 6,661 8,376
Long-term debt 22,250 19,524
Long-term debt designated under fair value option 8,239 8,144
Level 2 [Member] | Commercial Loans [Member]    
Fair Value Of Other Financial Instrument [Line Items]    
Commercial loans designated under fair value option and held for sale 315 384
Loans held for sale 92 144
Level 2 [Member] | Consumer Loans [Member] | Residential Mortgage [Member]    
Fair Value Of Other Financial Instrument [Line Items]    
Loans held for sale 19 14
Level 2 [Member] | Consumer Loans [Member] | Other consumer [Member]    
Fair Value Of Other Financial Instrument [Line Items]    
Loans held for sale 0 0
Level 2 [Member] | Deposits Without Fixed Maturities [Member]    
Fair Value Of Other Financial Instrument [Line Items]    
Deposits 114,005 105,962
Level 2 [Member] | Deposits With Fixed Maturities [Member]    
Fair Value Of Other Financial Instrument [Line Items]    
Deposits 1,913 2,813
Level 3 [Member]    
Fair Value Of Other Financial Instrument [Line Items]    
Short-term financial assets 43 48
Federal funds sold and securities purchased under resale agreements 0 0
Non-derivative trading assets 3,095 3,093
Derivatives 32 48
Securities 0 0
Commercial loans, net of allowance for credit losses 64,490 58,891
Short-term financial liabilities 43 48
Consumer loans, net of allowance for credit losses 18,679 17,896
Short-term borrowings designated under fair value option 0  
Deposits designated under fair value option 1,817 1,968
Non-derivative trading liabilities 0 0
Derivatives 23 29
Long-term debt 0 0
Long-term debt designated under fair value option 662 647
Level 3 [Member] | Commercial Loans [Member]    
Fair Value Of Other Financial Instrument [Line Items]    
Commercial loans designated under fair value option and held for sale 0 0
Loans held for sale 0 0
Level 3 [Member] | Consumer Loans [Member] | Residential Mortgage [Member]    
Fair Value Of Other Financial Instrument [Line Items]    
Loans held for sale 4 5
Level 3 [Member] | Consumer Loans [Member] | Other consumer [Member]    
Fair Value Of Other Financial Instrument [Line Items]    
Loans held for sale 88 66
Level 3 [Member] | Deposits Without Fixed Maturities [Member]    
Fair Value Of Other Financial Instrument [Line Items]    
Deposits 0 0
Level 3 [Member] | Deposits With Fixed Maturities [Member]    
Fair Value Of Other Financial Instrument [Line Items]    
Deposits 0 0
Carrying Value [Member]    
Fair Value Of Other Financial Instrument [Line Items]    
Short-term financial assets 21,179 31,746
Federal funds sold and securities purchased under resale agreements 16,112 1,413
Non-derivative trading assets 13,840 15,490
Derivatives 5,480 7,258
Securities 47,245 43,609
Commercial loans, net of allowance for credit losses 63,099 57,595
Short-term financial liabilities 10,715 12,861
Consumer loans, net of allowance for credit losses 19,870 19,466
Short-term borrowings designated under fair value option 2,070  
Deposits designated under fair value option 6,632 7,346
Non-derivative trading liabilities 669 705
Derivatives 6,691 8,413
Long-term debt 21,666 18,733
Long-term debt designated under fair value option 8,901 8,791
Carrying Value [Member] | Commercial Loans [Member]    
Fair Value Of Other Financial Instrument [Line Items]    
Commercial loans designated under fair value option and held for sale 315 384
Loans held for sale 92 144
Carrying Value [Member] | Consumer Loans [Member] | Residential Mortgage [Member]    
Fair Value Of Other Financial Instrument [Line Items]    
Loans held for sale 23 18
Carrying Value [Member] | Consumer Loans [Member] | Other consumer [Member]    
Fair Value Of Other Financial Instrument [Line Items]    
Loans held for sale 88 66
Carrying Value [Member] | Deposits Without Fixed Maturities [Member]    
Fair Value Of Other Financial Instrument [Line Items]    
Deposits 114,005 105,962
Carrying Value [Member] | Deposits With Fixed Maturities [Member]    
Fair Value Of Other Financial Instrument [Line Items]    
Deposits 1,910 2,810
Estimate of fair value [Member]    
Fair Value Of Other Financial Instrument [Line Items]    
Short-term financial assets 21,179 31,746
Federal funds sold and securities purchased under resale agreements 16,112 1,413
Non-derivative trading assets 13,840 15,490
Derivatives 5,480 7,258
Securities 47,412 43,835
Commercial loans, net of allowance for credit losses 64,490 58,891
Short-term financial liabilities 10,715 12,861
Consumer loans, net of allowance for credit losses 18,679 17,896
Short-term borrowings designated under fair value option 2,070  
Deposits designated under fair value option 6,632 7,346
Non-derivative trading liabilities 669 705
Derivatives 6,691 8,413
Long-term debt 22,250 19,524
Long-term debt designated under fair value option 8,901 8,791
Estimate of fair value [Member] | Commercial Loans [Member]    
Fair Value Of Other Financial Instrument [Line Items]    
Commercial loans designated under fair value option and held for sale 315 384
Loans held for sale 92 144
Estimate of fair value [Member] | Consumer Loans [Member] | Residential Mortgage [Member]    
Fair Value Of Other Financial Instrument [Line Items]    
Loans held for sale 23 19
Estimate of fair value [Member] | Consumer Loans [Member] | Other consumer [Member]    
Fair Value Of Other Financial Instrument [Line Items]    
Loans held for sale 88 66
Estimate of fair value [Member] | Deposits Without Fixed Maturities [Member]    
Fair Value Of Other Financial Instrument [Line Items]    
Deposits 114,005 105,962
Estimate of fair value [Member] | Deposits With Fixed Maturities [Member]    
Fair Value Of Other Financial Instrument [Line Items]    
Deposits $ 1,913 $ 2,813